A two-phase flow state testing device for a plate-fin heat exchanger and its reconstruction method

Abstract

The invention discloses a two-phase flow state testing device of a plate-fin heat exchanger and a reconstruction method thereof. Connected, the lower partition of the plate-fin heat exchanger is connected to an external heating device, and a number of through matrix detection ports are uniformly opened on the upper partition, and each detection port is equipped with an optical fiber bundle; one end of the optical fiber bundle is sealed and fixed in the detection port. The other end is connected to the output end of the beam splitter; the other side of the beam splitter opposite to the output end is the incident end, and the laser is arranged at intervals perpendicular to the incident end; the photodetectors for receiving detection signals are arranged at intervals at the receiving end; the photodetectors are externally connected processing module. The invention evenly arranges sampling through holes at specific positions of the upper partition, and uses multi-core optical fiber bundles to obtain laser signals that can reflect the internal two-phase state, thereby obtaining the distribution of vapor and liquid phases in the entire range of the plate-fin heat exchanger.

Description

technical field [0001] The invention belongs to the technical field of optical detection, and relates to a two-phase flow state testing device of a plate-fin heat exchanger and a reconstruction method thereof. Background technique [0002] Plate-fin heat exchanger is a kind of heat exchange equipment with compact structure, light weight and high heat transfer efficiency. It has high specific surface area, large number of heat transfer units, and high-efficiency heat transfer characteristics. It is suitable for occasions with complex flow channel layout. It is widely used in industrial sectors such as petrochemical, aviation, vehicles, power machinery, air separation, cryogenic fields, atomic energy and aerospace, and has made remarkable achievements in utilizing heat energy, recovering waste heat, saving raw materials, reducing costs and some special purposes. economic benefits. [0003] In recent years, with the rapid development of industry, the demand for efficient trans...

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Problems solved by technology

At present, the research on the heat transfer characteristics in the channel of the plate-fin heat exchanger and the optimization of the fin size mainly focus on the single-phase fluid convective heat transfer, while the research on the boiling heat transfer characteristics of the coolant in the heat exchanger has a phase change. There are few related studies

At the same time, because the plate-fin heat exchanger has a closed metal structure and complex vapor-liquid two-phase flow, it is extremely difficult to obtain information about the phase distribution and flow characteristics inside the heat exchanger.

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